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IP Telephony: Comparison of Subjective Assessment Methods for Voice Quality Evaluation |
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| รหัสดีโอไอ | |
| Creator | Therdpong DAENGSI, Chai WUTIWIWATCHAI, Apiruck PREECHAYASOMBOON, Saowanit SUKPARUNGSEE |
| Title | IP Telephony: Comparison of Subjective Assessment Methods for Voice Quality Evaluation |
| Publisher | Walailak University |
| Publication Year | 2557 |
| Journal Title | Walailak Journal of Science and Technology |
| Journal Vol. | 11 |
| Journal No. | 2 |
| Page no. | 87-92 |
| Keyword | IP Telephony, VoIP, voice quality, subjective tests, MOS |
| ISSN | 1686-3933 |
| Abstract | One problem that often occurs after installing/implementing an IP telephony system is voice quality. Although there are objective measurement tools for voice quality evaluation, the prices of these are very expensive. Therefore, back to basics, this paper focuses on subjective tests. This study used the data from three tests, consisting of listening-opinion tests, conversational tests and interview tests. All were conducted using the same IP telephony system with G.711 codec. All tests, following the ITU-T P.800, were in the best condition. The subjects who participated in the tests were 163 students and 1 worker in King Mongkut |
